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Proof step 6 from proof depths-one (previous step)

depths(t, i) = j ', i ≠ j ∨ t ≠ Leaf ⊦

User applied rule insert lemma

And obtained the following new goals

Proof step 2:
⊦ # depths(t, i) = 1 ↔ t = Leaf
Proof step 5:
# depths(t, i) = 1 ↔ t = Leaf, depths(t, i) = j ', i ≠ j ∨ t ≠ Leaf ⊦

Rule argument

[x0lemmaarg: spec-name: instance-name: lemma-name: depths-size-one antecedent: succedent: # depths(t, i) = 1 ↔ t = Leaf substlist: [t, i] → [t, i] add preconditions?: F is rewrite lemma?: F current spec?: T rotate lemma?: F replace all?: F paths: () dummy: () ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (t, i)]]